i have two UNUSED slides for sale. one is a mobius and the other is b. wilson. both of the slides are 18 mm. the first slide is a mobius five hole slide. i have included the aqualab product link for the slide below the pictures. this retails for $40. http://aqualabtechnologies.com/scie.../mobius-glassworks-five-hole-slide-18-mm.html i also have a b. wilson disc screen slide for sale. again, the aqualb product link for the slide is included after the pictures. this slide also retails for $40. http://aqualabtechnologies.com/scie...lson-glass-clear-disc-screen-slide-14-mm.html i will sell both slides together for $50.00. if you are wanting to split the two up, we can discuss that as well. I will pay shipping to CONUS. i am currently looking for an arizer solo (black), so i would be open to a trade involving one. of course, i would add on my end if i ended up trading.